!which of these statements is true about chemical reaction rates? the reaction rates can change. the reaction rates cannot increase. the reaction rates cannot decrease. the reaction rates are always constant.

in a chemical reaction,mostly everything changes,it could be color,texture and others.so i think for sure its the first one.( The reaction rates can change)

iron and sleel

make siroeel

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements